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I appeared for an interview before Aug 2024, where I was asked the following questions.
Design an MVC controller system to route URLs to the appropriate controllers based on the URL structure.
Define a routing mechanism that maps URLs to controller actions.
Use a hierarchical structure where each segment of the URL corresponds to a controller.
Example: For 'xyz.com/a/b/c', 'a' routes to 'AController', 'b' to 'BController', and 'c' to 'CController'.
Implement a method to parse the URL and invoke the correspond...
Autocomplete in IDEs helps developers write code faster by suggesting code snippets and completing code as they type.
Autocomplete should suggest code snippets based on the context of the code being written
Autocomplete should prioritize suggestions based on frequency of use
Autocomplete should also suggest variable and function names
Autocomplete should be customizable to allow for user-defined snippets and suggestions
Exa...
My weakness is public speaking.
I tend to get nervous when speaking in front of large groups.
I am working on improving my public speaking skills by practicing and seeking feedback.
I have taken courses and attended workshops to help me overcome my fear of public speaking.
Comparing 2 basketball game scenarios with different number of trials and baskets required to win
Calculate the probability of winning in each game scenario using binomial distribution formula
Compare the probabilities to determine which game scenario is preferable
In game1, the probability of winning is p. In game2, the probability of winning is the sum of probabilities of making 2 or 3 baskets
If p is high, game1 is pref...
I want to join Visa to contribute to innovative payment solutions and be part of a global leader in financial technology.
Visa is at the forefront of digital payment innovation, allowing me to work on cutting-edge technologies.
The company's commitment to security aligns with my passion for developing secure software solutions.
Visa's global presence offers opportunities to collaborate with diverse teams and learn from di...
What people are saying about PayPal
I applied via Campus Placement and was interviewed in Dec 2016. There were 5 interview rounds.
Implement a Binary Search Tree (BST) from an array of values, allowing efficient searching, insertion, and deletion.
A BST is a tree data structure where each node has at most two children.
For each node, values in the left subtree are less, and values in the right subtree are greater.
To build a BST from an array, iterate through the array and insert each element into the tree.
Example: For array [7, 3, 9, 1, 5], the BST ...
Print the given Binary search tree in ascending order
Traverse the left subtree recursively
Print the root node
Traverse the right subtree recursively
Discussing my experience with software development projects and technologies used.
Developed a web application using React and Node.js, improving user engagement by 30%.
Implemented RESTful APIs for seamless data exchange between front-end and back-end.
Collaborated with cross-functional teams to deliver projects on time and within budget.
Utilized Agile methodologies to enhance project management and team communication.
Chennai faces problems related to water scarcity, traffic congestion, and pollution.
Water scarcity due to inadequate rainfall and poor management of water resources.
Traffic congestion due to the increasing number of vehicles and poor road infrastructure.
Pollution caused by industries, vehicular emissions, and improper waste disposal.
Need more context on the question to provide an answer.
Please provide more information on the problem to be solved.
Without context, it is difficult to provide a solution.
Can you please provide more details on the problem statement?
I appeared for an interview before Apr 2021.
Round duration - 45 minutes
Round difficulty - Easy
This was a technical interview round.
AJAX allows web pages to be updated asynchronously by exchanging data with a web server behind the scenes.
AJAX stands for Asynchronous JavaScript and XML.
It allows web pages to update content without reloading the entire page.
AJAX uses XMLHttpRequest object to send and receive data from a server.
Commonly used in web applications to provide a more responsive user experience.
SOAP is a protocol, while REST is an architectural style for web services.
SOAP is a protocol that uses XML for message format and relies on a request-response model.
REST is an architectural style that uses standard HTTP methods like GET, POST, PUT, DELETE.
SOAP is more rigid and requires more bandwidth, while REST is lightweight and flexible.
SOAP has built-in security features like WS-Security, while REST relies on exte...
GET is used to request data from a server, while POST is used to submit data to a server.
GET requests data from a specified resource, while POST submits data to be processed to a specified resource.
GET requests are cached by browsers, while POST requests are not.
GET requests can be bookmarked and shared, while POST requests cannot.
GET requests have length restrictions, while POST requests do not.
Example: Using GET to r...
The Observer Pattern is a behavioral design pattern where an object (subject) maintains a list of dependents (observers) that are notified of any state changes.
Allows for one-to-many dependency between objects
When the subject's state changes, all observers are automatically notified and updated
Commonly used in event handling systems and GUI frameworks
Round duration - 40 minutes
Round difficulty - Easy
This was the second technical interview round.
A singleton class is a class that can only have one instance created throughout the entire application.
Singleton classes have a private constructor to prevent multiple instances from being created.
They typically provide a static method to access the single instance.
Commonly used for logging, database connections, and configuration settings.
Immutability in Java refers to the property of objects whose state cannot be changed once they are created.
Immutability ensures that once an object is created, its state cannot be modified.
Immutable objects are thread-safe and can be shared without the risk of data corruption.
String class in Java is an example of an immutable class.
To create an immutable class, make the class final, all fields private, and provide only...
Dependency injection is a design pattern where components are given their dependencies rather than creating them internally.
Allows for easier testing by providing mock dependencies
Promotes loose coupling between components
Improves code reusability and maintainability
Examples: Constructor injection, Setter injection, Interface injection
To create an immutable class in Java, make the class final, make all fields private and final, provide only getter methods, and do not provide any setter methods.
Make the class final to prevent inheritance.
Make all fields private and final to prevent modification.
Provide only getter methods to access the fields.
Do not provide any setter methods to modify the fields.
Round duration - 30 minutes
Round difficulty - Easy
HR round with typical behavioral problems.
Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
I appeared for an interview before Apr 2021.
Round duration - 60 minutes
Round difficulty - Easy
Technical Interview round with questions on DSA.
You are given an array of integers PRICES
where PRICES[i]
represents the price of a stock on the i-th day, and an integer K
representing the number of transactions you...
Determine maximum profit with at most K transactions by buying and selling stocks on given days.
Iterate through the array of prices while keeping track of the maximum profit achievable with at most K transactions.
Use dynamic programming to store the maximum profit at each day and transaction count.
Consider buying and selling stocks at each day to calculate the maximum profit.
Return the maximum profit achievable with at...
Given a Binary Tree consisting of 'N' nodes with integer values, your task is to determine the in-order traversal of the Binary Tree.
The first line contains ...
The task is to determine the in-order traversal of a Binary Tree given in level order.
Implement a function to perform in-order traversal of a Binary Tree
Use recursion to traverse left subtree, visit root, and then traverse right subtree
Handle null nodes denoted by -1 in the input
Round duration - 30 minutes
Round difficulty - Easy
HR round with typical behavioral problems.
Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
A memory leak occurs when a program allocates memory but fails to release it, leading to reduced performance or crashes.
Memory leaks happen when dynamically allocated memory is not freed after use.
They can lead to increased memory usage over time, causing slowdowns.
Example: In C/C++, forgetting to call 'free()' on allocated memory.
In Java, memory leaks can occur if references to unused objects are retained.
Tools like V...
Arrays have fixed size and can lead to memory wastage and performance issues.
Arrays have a fixed size and cannot be resized dynamically.
Inserting or deleting elements in an array can be time-consuming.
Arrays can lead to memory wastage if they are not fully utilized.
Arrays can cause performance issues if they are too large and need to be traversed frequently.
Arrays can also be prone to buffer overflow attacks.
Example: A...
Function to hide text on mouse click in JavaScript
Create a function that takes an element as input
Add an event listener to the element for a mouse click
Toggle the element's display property between 'none' and its original value
Find two elements in an unsorted array whose sum is equal to a given number x.
Use a hash table to store the difference between x and each element in the array.
Iterate through the array and check if the current element is in the hash table.
Return the pair of elements that add up to x.
A Binary Search Tree (BST) is a data structure that maintains sorted order for efficient searching, insertion, and deletion operations.
A BST is a binary tree where each node has at most two children.
For any given node, all values in the left subtree are less, and all values in the right subtree are greater.
Example: Inserting values 10, 5, 15 creates a BST with 10 as root, 5 as left child, and 15 as right child.
BST oper...
Number of possible BSTs with 2 and 3 nodes.
For 2 nodes, only 2 BSTs are possible.
For 3 nodes, 5 BSTs are possible.
Number of BSTs can be calculated using Catalan numbers formula.
Catalan(2) = 2, Catalan(3) = 5.
Answering the question about possible trees with two and three nodes.
For two nodes, there is only one possible tree.
For three nodes, there are three possible trees.
The formula for calculating the number of possible trees with n nodes is (2n-3)!!.
The double exclamation mark represents the double factorial function.
The double factorial function is defined as n!! = n(n-2)(n-4)...(1 or 2).
B+ trees are balanced trees used for indexing and searching large amounts of data.
B+ trees are similar to binary search trees but have multiple keys per node.
They are commonly used in databases and file systems.
B+ trees have a high fanout, reducing the number of disk accesses required for searching.
They are also self-balancing, ensuring efficient performance even with large amounts of data.
Example: In a database, a B+ ...
I would like to understand more about the team dynamics and project expectations in this role.
Can you describe the team structure and how collaboration typically works?
What are the key projects the team is currently working on?
How does the company support professional development and growth for engineers?
What are the biggest challenges the team is facing right now?
How do you measure success for this role in the first s...
Find minimum no of platforms required to avoid collision between trains based on their arrival and departure times.
Sort both arrays in ascending order
Initialize platform count and max count to 1
Loop through both arrays and compare arrival and departure times
If arrival time is less than or equal to departure time, increment platform count
Else, decrement platform count
Update max count if platform count is greater than ma...
JVM stands for Java Virtual Machine. It is an abstract machine that provides a runtime environment for Java programs.
JVM is responsible for interpreting the compiled Java code and executing it.
It provides platform independence by converting bytecode into machine-specific code.
JVM has various components like class loader, bytecode verifier, and execution engine.
Compiler converts source code into bytecode, while JVM exec...
Creating a SQL query based on a given relational schema and problem statement.
Understand the schema: Identify tables, columns, and relationships.
Clarify the problem statement: Determine what data is needed.
Write the SQL query: Use SELECT, JOIN, WHERE clauses as necessary.
Test the query: Ensure it returns the expected results.
Optimize if needed: Check for performance improvements.
PayTM is an Indian e-commerce payment system and digital wallet company.
PayTM was founded in 2010 by Vijay Shekhar Sharma.
It started as a mobile recharge and bill payment platform.
PayTM has expanded to offer services like online shopping, movie ticket booking, and travel bookings.
It also offers a digital wallet that can be used to pay for various services and products.
PayTM has over 350 million registered users and is ...
I would like to add a feature for splitting bills among friends.
The feature would allow users to split bills for movies, dinners, etc.
Users can select friends from their contact list and split the bill equally or unequally.
The app would send a notification to the selected friends to pay their share.
The feature would make it easier for users to split expenses and avoid awkward conversations.
It would also encourage more ...
My favourite app is Spotify. I would like to see improvements in the algorithm for personalized playlists.
Improved algorithm for personalized playlists
Better integration with social media platforms
Option to create collaborative playlists with friends
I choose NIT Hamirpur because of its excellent academic reputation and beautiful campus.
NIT Hamirpur has a strong focus on academics and research, which aligns with my career goals.
The campus is located in a serene and picturesque location, which provides a conducive environment for learning.
The faculty members are highly experienced and knowledgeable, and are always willing to help students.
The college has state-of-th...
Find the longest palindromic substring in a string using Manacher's algorithm for O(n) time complexity.
Use Manacher's algorithm, which preprocesses the string to handle even-length palindromes.
Transform the string by inserting a unique character (e.g., '#') between each character and at the ends.
Maintain an array to store the radius of palindromes centered at each character.
Expand around the center to find the longest ...
The value of pie is a mathematical constant approximately equal to 3.14159.
Pie is the ratio of the circumference of a circle to its diameter.
It is an irrational number, meaning it cannot be expressed as a finite decimal or fraction.
Pie is commonly used in geometry and trigonometry calculations.
The value of pie is often approximated as 3.14 or 22/7.
Yes, I believe I will be able to fit in the company based on my experience, skills, and values.
I have experience working in diverse teams and adapting to different work cultures.
I share the company's values and vision, which align with my own.
I am eager to learn and contribute to the team, fostering a positive work environment.
I have strong communication skills, which are essential for collaboration and teamwork.
based on 2 interview experiences
Difficulty level
Duration
Software Engineer
357
salaries
| ₹20.4 L/yr - ₹35 L/yr |
Software Engineer2
355
salaries
| ₹22.5 L/yr - ₹40 L/yr |
Senior Software Engineer
295
salaries
| ₹24.7 L/yr - ₹42.5 L/yr |
Software Engineer III
291
salaries
| ₹30 L/yr - ₹56 L/yr |
Data Scientist
284
salaries
| ₹27.7 L/yr - ₹50 L/yr |
Paytm
Razorpay
Visa
MasterCard